The Theia top is a made to measure and size inclusive pattern, this means you measure yourself as the pattern suggests and then follow the instructions. This means the pattern can be made for any size or age.
The pattern is an advanced beginner level that uses US terminology. The pattern has detailed steps, pictures throughout and stitch graphs to help guide you.
You will need any type of 4 ply (fingering weight) cotton yarn and a 3mm crochet hook, I used roughly 650m for the sample size (small UK 8).
You will also need elastic (size between 2-4mm) if you’re planning on doing the cuffed sleeves, however you can get away without the elastic as we add decreases into the cuffs anyway.